Bolt / Screw descriptions

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Damaraland

Race Dog
Joined
Oct 24, 2011
Messages
646
Reaction score
89
Location
Windhoek
Bike
KTM 990 Adventure
Somehow I'm not asking google the right questions - what does the numbering on screw part numbers mean.  Take the following for example:

HH COLLAR SCREW M 8X16 WS=10

I assume 8 is diameter and 16 is gauge?

Is the 10 length?  In what unit?

What does the HH and the M stand for?
 
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